feat: initial Vite/React frontend service template

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.dockerignore

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+node_modules
+dist
+.git
+.forgejo

.forgejo/template

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+package.json
+package-lock.json
+README.md
+index.html

.forgejo/workflows/ci.yaml

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+# Full pipeline: checks -> build+push image -> bump tag in gitops repo.
+# The heavy lifting lives in nholtware/workflows composite actions; ArgoCD
+# takes over from the gitops commit.
+on:
+  push:
+    branches: [main]
+
+jobs:
+  checks:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: http://192.168.1.230:3000/nholtware/workflows/node-checks@main
+      - uses: http://192.168.1.230:3000/nholtware/workflows/lint-checks@main
+
+  deploy:
+    needs: checks
+    runs-on: host
+    steps:
+      - uses: actions/checkout@v4
+      - uses: http://192.168.1.230:3000/nholtware/workflows/build-push@main
+        with:
+          app-name: ${{ github.event.repository.name }}
+          registry-user: ${{ secrets.REGISTRY_USER }}
+          registry-token: ${{ secrets.REGISTRY_TOKEN }}
+      - uses: http://192.168.1.230:3000/nholtware/workflows/gitops-bump@main
+        with:
+          app-name: ${{ github.event.repository.name }}
+          gitops-token: ${{ secrets.GITOPS_TOKEN }}

.forgejo/workflows/pr.yaml

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+# PR checks: lint + test only. No build/deploy -- that's ci.yaml's job on push to main.
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  checks:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: http://192.168.1.230:3000/nholtware/workflows/node-checks@main
+      - uses: http://192.168.1.230:3000/nholtware/workflows/lint-checks@main

.gitignore

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+node_modules/
+dist/
+.env

.nvmrc

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+v22

.prettierignore

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+dist
+node_modules
+package-lock.json

.prettierrc.json

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+{
+  "semi": true,
+  "trailingComma": "all"
+}

CLAUDE.md

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+# Service conventions
+
+- Stack: Vite + React 19 + TypeScript + React Router v8 in data mode (`createBrowserRouter`, SPA, no SSR), Node 22 for build only, vitest + Testing Library, nginx-unprivileged at runtime.
+- Do NOT rename npm scripts (`lint`, `test`, `format:check`, `build`): the shared CI composite actions call them.
+- Routes: table in `src/routes.tsx`, one component per file in `src/routes/`, loaders exported next to their component.
+- Runtime config: read only via `getConfig()` (`src/lib/config.ts`). A new browser-visible env var must be added to `VARS` in `docker-entrypoint.d/10-config.sh`, `AppConfig`, and the gitops Deployment. No secrets: config.js is public.
+- Backend calls: `apiGet()` in `src/lib/api.ts`, relative to `API_BASE_URL` (`/api` same-host ingress path, stripped before the backend). No CORS.
+- Serving contract: port 8080, `/healthz` 200, SPA fallback, immutable `/assets/`, no-cache `index.html`/`config.js` (`nginx/default.conf`).
+- Deploy: push to `main` -> Forgejo CI -> image -> gitops bump -> ArgoCD. Never `kubectl apply` by hand.

Dockerfile

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+# Build stage: Vite -> static dist/. GIT_SHA is passed by the build-push action.
+FROM node:22.23.4-alpine AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY . .
+ARG GIT_SHA=dev
+ENV VITE_GIT_SHA=${GIT_SHA}
+RUN npx vite build
+
+# Runtime stage: static files only, no Node. Runs as uid 101, listens on 8080.
+FROM nginxinc/nginx-unprivileged:1.31.7-alpine
+COPY nginx/default.conf /etc/nginx/conf.d/default.conf
+COPY --chmod=0755 docker-entrypoint.d/10-config.sh /docker-entrypoint.d/10-config.sh
+# html dir owned by nginx so 10-config.sh can write config.js at start.
+COPY --from=build --chown=101:101 /app/dist /usr/share/nginx/html
+EXPOSE 8080

README.md

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+# ${REPO_NAME}
+
+Frontend service generated from `nholtware/service-template-react`: a Vite +
+React 19 + React Router (data mode) SPA, served as static files by
+unprivileged nginx.
+
+## Develop
+
+```sh
+npm install
+npm run dev          # http://localhost:5173, /api proxied to API_PROXY_TARGET (default http://localhost:3000)
+npm test
+npm run lint
+npm run format
+```
+
+## Runtime config
+
+`/config.js` sets `window.__APP_CONFIG__`. In the container,
+`docker-entrypoint.d/10-config.sh` writes it at start from env vars, so one
+image runs in every environment. Read values through `getConfig()` in
+`src/lib/config.ts`.
+
+| Env var        | Default | Meaning                                         |
+| -------------- | ------- | ----------------------------------------------- |
+| `API_BASE_URL` | `/api`  | Backend base URL; `/api` is the same-host route |
+| `APP_NAME`     | `app`   | Display name                                    |
+
+Everything in `config.js` is public. Never put secrets there.
+
+## Container
+
+- `GIT_SHA` build arg is baked in as `import.meta.env.VITE_GIT_SHA`.
+- nginx listens on 8080: `/healthz` returns 200, unknown paths fall back to
+  `index.html`, `/assets/*` are cached as immutable, and `index.html` and
+  `config.js` are not cached.
+
+## Deploy
+
+Push to `main`: Forgejo CI runs lint/test/format, builds and pushes
+`192.168.1.230:3000/nholtware/${REPO_NAME}:<sha>`, and bumps the tag in the
+gitops repo. ArgoCD then syncs it. Manifests come from gitops
+`templates/frontend/`. The repo needs Actions secrets `REGISTRY_USER`,
+`REGISTRY_TOKEN`, and `GITOPS_TOKEN`.

commitlint.config.js

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+export default {
+  extends: ["@commitlint/config-conventional"],
+};

docker-entrypoint.d/10-config.sh

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+#!/bin/sh
+# Run by the nginx image's entrypoint before nginx starts. Writes the runtime
+# config the SPA reads as window.__APP_CONFIG__, so one image serves every
+# environment. To expose a new env var to the browser, add its name to VARS.
+# Never put secrets here: everything in config.js is public.
+set -eu
+
+VARS="API_BASE_URL APP_NAME"
+OUT=/usr/share/nginx/html/config.js
+
+: "${API_BASE_URL:=/api}"
+: "${APP_NAME:=app}"
+
+json_escape() {
+  printf '%s' "$1" | sed -e 's/\\/\\\\/g' -e 's/"/\\"/g'
+}
+
+body=""
+for name in $VARS; do
+  eval "value=\${$name:-}"
+  [ -n "$body" ] && body="$body,"
+  body="$body\"$name\":\"$(json_escape "$value")\""
+done
+
+printf 'window.__APP_CONFIG__ = {%s};\n' "$body" > "$OUT"
+echo "10-config.sh: wrote $OUT"

eslint.config.js

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+import reactHooks from "eslint-plugin-react-hooks";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+  {
+    ignores: ["dist/**", "public/**"],
+  },
+  ...tseslint.configs.recommended,
+  reactHooks.configs.flat.recommended,
+);

index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>${REPO_NAME}</title>
+    <!-- Runtime config, generated at container start (docker-entrypoint.d/10-config.sh). -->
+    <script src="/config.js"></script>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

nginx/default.conf

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+server {
+    listen 8080;
+    server_name _;
+    root /usr/share/nginx/html;
+
+    # Liveness/readiness for k8s probes.
+    location = /healthz {
+        access_log off;
+        default_type text/plain;
+        return 200 "ok\n";
+    }
+
+    # Runtime config, written at container start; never cache.
+    location = /config.js {
+        add_header Cache-Control "no-store" always;
+    }
+
+    # Hashed build assets: cache forever; a missing asset is a real 404.
+    location /assets/ {
+        add_header Cache-Control "public, max-age=31536000, immutable" always;
+        try_files $uri =404;
+    }
+
+    location = /index.html {
+        add_header Cache-Control "no-cache" always;
+    }
+
+    # SPA fallback: unknown paths get index.html; the router handles them.
+    location / {
+        try_files $uri /index.html;
+    }
+}

package.json

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+{
+  "name": "${REPO_NAME}",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Frontend service generated from nholtware/service-template-react",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview",
+    "test": "vitest run",
+    "lint": "eslint . && tsc --noEmit",
+    "format": "prettier --write .",
+    "format:check": "prettier --check ."
+  },
+  "engines": {
+    "node": ">=22"
+  },
+  "dependencies": {
+    "react": "^19.3.1",
+    "react-dom": "^19.3.1",
+    "react-router": "^8.5.1"
+  },
+  "devDependencies": {
+    "@commitlint/cli": "^21.2.4",
+    "@commitlint/config-conventional": "^21.2.4",
+    "@testing-library/jest-dom": "^7.0.1",
+    "@testing-library/react": "^16.3.3",
+    "@testing-library/user-event": "^14.6.8",
+    "@types/node": "^22.20.5",
+    "@types/react": "^19.3.0",
+    "@types/react-dom": "^19.3.0",
+    "@vitejs/plugin-react": "^6.2.1",
+    "eslint": "^10.14.0",
+    "eslint-plugin-react-hooks": "^7.1.1",
+    "jsdom": "^30.1.3",
+    "prettier": "^3.9.10",
+    "typescript": "^6.0.3",
+    "typescript-eslint": "^8.72.1",
+    "vite": "^8.3.6",
+    "vitest": "^5.1.0"
+  }
+}

public/config.js

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+// Dev-only default. In the container this file is regenerated at start from env vars.
+window.__APP_CONFIG__ = { API_BASE_URL: "/api", APP_NAME: "dev" };

src/app.test.tsx

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+import { render, screen } from "@testing-library/react";
+import { createMemoryRouter, RouterProvider } from "react-router";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { routes } from "./routes";
+
+function renderAt(path: string) {
+  const router = createMemoryRouter(routes, { initialEntries: [path] });
+  return render(<RouterProvider router={router} />);
+}
+
+beforeEach(() => {
+  window.__APP_CONFIG__ = { API_BASE_URL: "/api", APP_NAME: "test-app" };
+});
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+});
+
+describe("app", () => {
+  it("home shows the app name from runtime config and the build sha", async () => {
+    renderAt("/");
+    expect(
+      await screen.findByRole("heading", { name: "test-app" }),
+    ).toBeInTheDocument();
+    expect(screen.getByTestId("build-sha")).toHaveTextContent("dev");
+  });
+
+  it("status fetches / and /readyz under API_BASE_URL and renders the JSON", async () => {
+    const fetchMock = vi.fn(async (url: string) => {
+      const body =
+        url === "/api/readyz" ? { status: "ready" } : { service: "svc" };
+      return new Response(JSON.stringify(body), { status: 200 });
+    });
+    vi.stubGlobal("fetch", fetchMock);
+
+    renderAt("/status");
+
+    expect(await screen.findByText(/GET \/readyz/)).toBeInTheDocument();
+    expect(screen.getByText(/"status": "ready"/)).toBeInTheDocument();
+    expect(screen.getByText(/"service": "svc"/)).toBeInTheDocument();
+    expect(fetchMock.mock.calls.map((c) => c[0])).toEqual([
+      "/api/",
+      "/api/readyz",
+    ]);
+  });
+
+  it("status shows the error page when the backend is unreachable", async () => {
+    vi.stubGlobal(
+      "fetch",
+      vi.fn(async () => {
+        throw new Error("network down");
+      }),
+    );
+    renderAt("/status");
+    expect(await screen.findByRole("alert")).toHaveTextContent("network down");
+  });
+});

src/lib/api.ts

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+import { getConfig } from "./config";
+
+export interface ApiResult {
+  path: string;
+  status: number;
+  body: unknown;
+}
+
+// Fetch a backend path through the same-host /api ingress route.
+export async function apiGet(path: string): Promise<ApiResult> {
+  const base = getConfig().API_BASE_URL.replace(/\/$/, "");
+  const res = await fetch(`${base}${path}`, {
+    headers: { Accept: "application/json" },
+  });
+  const text = await res.text();
+  let body: unknown = text;
+  try {
+    body = JSON.parse(text);
+  } catch {
+    // non-JSON response; keep the raw text
+  }
+  return { path, status: res.status, body };
+}

src/lib/config.ts

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+export interface AppConfig {
+  API_BASE_URL: string;
+  APP_NAME: string;
+}
+
+declare global {
+  interface Window {
+    __APP_CONFIG__?: Partial<AppConfig>;
+  }
+}
+
+const defaults: AppConfig = { API_BASE_URL: "/api", APP_NAME: "app" };
+
+// Runtime config comes from /config.js (window.__APP_CONFIG__), so one image
+// serves every environment. Read it at call time so tests can override it.
+export function getConfig(): AppConfig {
+  return { ...defaults, ...(window.__APP_CONFIG__ ?? {}) };
+}
+
+export const buildSha: string = import.meta.env.VITE_GIT_SHA ?? "dev";

src/main.tsx

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+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { createBrowserRouter, RouterProvider } from "react-router";
+import { routes } from "./routes";
+
+const router = createBrowserRouter(routes);
+
+createRoot(document.getElementById("root")!).render(
+  <StrictMode>
+    <RouterProvider router={router} />
+  </StrictMode>,
+);

src/routes.tsx

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+import type { RouteObject } from "react-router";
+import { ErrorPage } from "./routes/ErrorPage";
+import { Home } from "./routes/Home";
+import { Layout } from "./routes/Layout";
+import { Status, statusLoader } from "./routes/Status";
+
+// Data-mode route table. Add pages here; loaders live next to their component.
+export const routes: RouteObject[] = [
+  {
+    path: "/",
+    element: <Layout />,
+    errorElement: <ErrorPage />,
+    children: [
+      { index: true, element: <Home /> },
+      { path: "status", element: <Status />, loader: statusLoader },
+    ],
+  },
+];

src/routes/ErrorPage.tsx

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+import { isRouteErrorResponse, useRouteError } from "react-router";
+
+export function ErrorPage() {
+  const error = useRouteError();
+  const message = isRouteErrorResponse(error)
+    ? `${error.status} ${error.statusText}`
+    : error instanceof Error
+      ? error.message
+      : String(error);
+  return (
+    <section role="alert">
+      <h1>Something went wrong</h1>
+      <p>{message}</p>
+    </section>
+  );
+}

src/routes/Home.tsx

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+import { buildSha, getConfig } from "../lib/config";
+
+export function Home() {
+  return (
+    <section>
+      <h1>{getConfig().APP_NAME}</h1>
+      <p>
+        Build: <code data-testid="build-sha">{buildSha}</code>
+      </p>
+    </section>
+  );
+}

src/routes/Layout.tsx

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+import { NavLink, Outlet } from "react-router";
+import { getConfig } from "../lib/config";
+
+export function Layout() {
+  return (
+    <>
+      <header>
+        <strong>{getConfig().APP_NAME}</strong>
+        <nav>
+          <NavLink to="/">Home</NavLink> |{" "}
+          <NavLink to="/status">Status</NavLink>
+        </nav>
+      </header>
+      <main>
+        <Outlet />
+      </main>
+    </>
+  );
+}

src/routes/Status.tsx

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+import { useLoaderData } from "react-router";
+import { apiGet, type ApiResult } from "../lib/api";
+
+export async function statusLoader(): Promise<ApiResult[]> {
+  return Promise.all([apiGet("/"), apiGet("/readyz")]);
+}
+
+export function Status() {
+  const results = useLoaderData<typeof statusLoader>();
+  return (
+    <section>
+      <h1>Backend status</h1>
+      {results.map((r) => (
+        <article key={r.path}>
+          <h2>
+            GET {r.path} &rarr; {r.status}
+          </h2>
+          <pre>{JSON.stringify(r.body, null, 2)}</pre>
+        </article>
+      ))}
+    </section>
+  );
+}

src/test-setup.ts

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+import "@testing-library/jest-dom/vitest";

src/vite-env.d.ts

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+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_GIT_SHA?: string;
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "jsx": "react-jsx",
+    "strict": true,
+    "noEmit": true,
+    "isolatedModules": true,
+    "skipLibCheck": true,
+    "types": ["vite/client", "node"]
+  },
+  "include": ["src", "vite.config.ts", "eslint.config.js"]
+}

vite.config.ts

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+import react from "@vitejs/plugin-react";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    // Local dev: proxy /api to a backend (e.g. the service-template-express dev server).
+    proxy: {
+      "/api": {
+        target: process.env.API_PROXY_TARGET ?? "http://localhost:3000",
+        rewrite: (p) => p.replace(/^\/api/, ""),
+      },
+    },
+  },
+  test: {
+    environment: "jsdom",
+    setupFiles: ["./src/test-setup.ts"],
+  },
+});